Java Scanner获取输入作为方法参数

利用Scanner.next()方法获取用户输入，并将其当作方法参数进行判断时出错。

main方法：

import java.util.*;

public class mapTest {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String command = sc.nextLine();
        Self me = new Self("I", 0);
        me.move(command);
    }
}

Self类的move方法：

public void move(String direction){
        if (direction == "n"){
            System.out.println("Heading to the North");
        }else if (direction == "w"){
            System.out.println("Heading to the West");
        }else if (direction == "s"){
            System.out.println("Heading to the South");
        }else if (direction == "e"){
            System.out.println("Heading to the East");
        }else{
            System.out.println("Wrong Code!");
        }
    }

输出
n
Wrong Code!

这是java，字符串比较要用equals，不能用==